Adults have a wingspan of about 27 centimetres (11 in), making it the largest moth found in Australia, and its wings have the largest documented surface area (300 square centimeters) of any living insect.

However, adult males have longer, slimmer tails on their wings than females do, making it somewhat easy to differentiate them in this way.

[4] Their larvae grow up to 12 cm (about 4.7 in), and will weigh around 54 grams in their final instar.

[4] They are a pale-blue or green color, with red dots along their sides and yellow spines.

[7] The larvae feed on the leaves of a number of rainforest trees including Dysoxylum mollissimum, Glochidion ferdinandi, Homalanthus populifolius, Polyscias elegans, Timonius rumphii, and Timonius singularis.